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I know there are some questions about UIImageView full-size have been asked but I'm still stuck with my problems.

I have a navigation bar, a scrollview, a UIImageView (named avatarTest) and a button. When I press the image, the UIImageView expand to full-size (320*480) and set the avatarTest.contentMode is ModeCenter.

My problems are:

  • UIImageView expanded to 320*480 but it didn't replace the navigation bar and status bar (like picture 1 and 2)

  • When I scroll down (now my button appear) and I press image, the UIImageView still expand according the old view. I want it expand to the full size, fill my current view (window) (like picture 3 and 4)

  • I want to know how to determine the origin frame (CGRectMake) of UIImageView by code so I can code for the 2nd press action (resize the image to origin)

enter image description here

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Here are some my viewController.m codes:

- (IBAction) expand {

    [UIView animateWithDuration:0.5f animations:^{
    CGRect screenRect = [[UIScreen mainScreen] bounds];
        CGFloat screenWidth = screenRect.size.width;
        CGFloat screenHeight = screenRect.size.height;            
        avatarTest.frame=CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, screenWidth, screenHeight);
        avatarTest.contentMode=UIViewContentModeCenter;
        avatarTest.backgroundColor = [UIColor blackColor];


    }]; 
}
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2 回答 2

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首先，你必须确保你的框架是正确的。我注意到您保留了原点的 x 和 y，也许每次都必须重置它们。一些实验很快就会产生预期的结果。

其次，通过设置contentMode来UIViewContentModeCenter防止图像被缩放。您需要启用一种内容模式来缩放图像，如下所示：

UIViewContentModeScaleToFill
UIViewContentModeScaleAspectFit
UIViewContentModeScaleAspectFill

最后，要覆盖导航栏，您必须从主视图中删除视图并将其添加到窗口中。

[avatarTest removeFromSuperview]; 
[self.view.window addSubview:avatarTest];

当然，要重置，您将不得不做相反的事情。
另外，我建议在viewDidDisappear.

于 2013-03-05T17:21:16.113 回答
2

要摆脱状态栏和导航栏，您必须隐藏它们。在没有动画的情况下隐藏它们......

[self.navigationController setNavigationBarHidden:YES animated:NO];
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];

当然，当您想要它们回来时，您必须将隐藏设置为 NO。

于 2013-03-05T17:25:23.490 回答